The red car reaches a speed of 100 km/h in 10 seconds and the yellow car reaches the same speed in 12 seconds.. After 10 seconds, the red car is travelling at a greater speed than the ye
Trang 1● Students were asked to WRITE all the answer on the ANSWER PAPER.
● Use a ball-point pen (blue or black ONLY).
● Answer all questions.
● Section A: 30 questions - WRITE only ONE letter (A, B, C or D)
● Section B: 10 questions - WRITE in PEN on the exam paper.
● Without sufficient explanation or work, correct answers may NOT be awarded full
marks
● Answer the questions in the spaces provided – there is more space than you need
Scientific calculators can be used.
Section A Multiple choice questions [60 pts]
1 Which of the following particles are used in determining the position of an element within the periodic table?
a protons only b neutrons only
c electrons only d protons and electrons
2 Magnesium has 12 electrons When in its ground state, its electron configuration is:
a 11 b 2,8,2 c 2,9 d 10,1
3 Which of the following statements about group 18 is incorrect?
a All atoms in group 18 have 18 electrons
b Their valence shells are full
c Group 18 is known as the noble gases
d They are very stable, tend not to react or bond with other atoms
4 Which of the following is best explained by Newton’s third law?
a Unbelted passengers will be thrown forward when a car stops suddenly
b A gun recoils when a shot is fired
c The acceleration of an object when a force is applied depends on the mass of the object
Trang 25 Sodium (Na) reacts violently when placed in water Elements that could be expected to react with water in a similar violent way are:
a Mg, Al, Si and P because they are in the same row
b Li, K, Rb and Cs because they are in the same column
c Ca, Y, Hf and Db because they are in the same diagonal
d Ne, Ni, Nb and Np because they all have N in their symbol
6 Which of the following best describes Newton's second law of motion?
a An object at rest will remain at rest unless acted upon by an unbalanced force
b Force is equal to the product of mass and acceleration
c For every action, there is an equal and opposite reaction
d The velocity of an object remains constant unless acted upon by a force
7 Which of the following atoms belongs to the same element as 1737 Cl?
a W b X c Y d Z
8 Nitrogen, N, is in period 2, group 15 Which of the following elements would have properties most similar to nitrogen?
a a phosphorus, P (period 3, group 15)
b b oxygen, O (period 2, group 16)
c c neon, Ne (period 2, group 18)
d d sodium, Na because its symbol also starts with N
9 A red car and a yellow car are driven along a flat section of road from a standing start The red car reaches a speed of 100 km/h in 10 seconds and the yellow car reaches the same speed in 12 seconds The cars continue their journey at 100 km/h for another 5 minutes Which of the following statements is correct?
a After 12 seconds, the red car and the yellow car have the same acceleration
b After 10 seconds, the red car is travelling at a greater speed than the yellow car
c After 12 seconds, the red car is travelling faster than the yellow car
d After 20 seconds, both cars have travelled the same total distance
10 Identify the sections of
the graph where the train
has zero acceleration
a D only
b A, B and C
c B, D and F
Trang 311 Select the option that best completes the following sentence As a car exits a freeway, its speedometer shows 80 km/h This is:
a the distance the car travelled in the previous hour
b the car's average speed
c the car's instantaneous speed
12 A skydiver glides to the ground at a steady speed of 10 m/s
Which statement below best describes what is happening?
a The upward force of air resistance acting on the skydiver is smaller than the
downward weight force that is acting
b The upward force of air resistance that is acting on the skydiver is larger than the size
of the downwards weight force
c The upward force of air resistance balances the downwards force of gravity acting on the skydiver
d The weight force that acts on the skydiver is larger than the upwards force of air resistance
13 Which of the following chemical reactions is a composition reaction?
a 2H2O(l) → 2H2(g) + O2(g)
b 2H2(g) + O2(g) → 2H2O(l)
c 2H2O(l) + 2Na(s) → 2NaOH(aq) + H2(g)
d 2HCl(aq) + 2Na(s) → 2NaCl(aq) + H2(g)
14 Which is the best term to describe the following reaction?
CaCO3(s) → CaO(s) + CO2(g)
a combination reaction b acid–metal
c precipitation reaction d decomposition reaction
15 A 110 N force is applied to a 65 kg mass The mass will accelerate at:
a 0.85 m/s2 b 1.6 m/s2 c 1.7 m/s2 d 5.9 m/s2
16 Explain why crushin solid reactants helps to increase the rate of reaction
a It exposes more of the solid reactant to the other reactants so there can be more reactions occurring at any one time
b It weakens the chemical bonds in the solid so that it is easier for the reaction to occur
c It helps the solid to dissolve
d All answers are correct
Trang 417 Select the option that best completes the following sentence
A speed-time graph for a train is shown below The most appropriate description of the train's motion is that it:
a sped up, stopped for a while, sped up in the opposite direction
b travelled at a constant speed, stopped for a while, returned to its starting position at a slower speed
c sped up, stayed at a constant speed for a while, gradually slowed down
18 Which of the following is a scalar quantity?
a Velocity b Speed c Acceleration d Force
19 What is the difference between speed and velocity?
a Speed is the rate of change of distance, while velocity is the rate of change of displacement
b Speed is the rate of change of displacement, while velocity is the rate of change of distance
c Speed and velocity are the same thing
d Speed and velocity have no relation to each other
20 Which of the following statements is true about acceleration?
a Acceleration is always negative
b Acceleration is always positive
c Acceleration can be negative or positive, depending on the direction of the velocity
d Acceleration is always zero
21 Which one of the following statements about friction is INCORRECT?
a Friction operates in the same direction as a moving object
b Friction is a contact force
c Friction between two moving objects produces heat
Trang 5For question 2 3, 24, 25, 26
Match the following acceleration descriptions to the velocity-time graphs.
23 Low positive acceleration then high positive acceleration Answer _
24 High negative acceleration then low positive acceleration Answer _
25 No acceleration Answer _
26 Steady positive acceleration Answer _
For question 2 7 , 2 8 , 2 9 , 30 Match the distance time-graph to speed time graph
Section B SHORT ANSWER [40 pts]
d nucleus
e atom
Trang 62 What is acceleration and the difference between positive and negative
3 What is the difference between instantaneous speed and average speed?
3 marks
4 If a car is travelling at a constant speed on a straight road, is it experiencing
any net force? Explain your answer based on Newton's first law 4 marks
5 What does Newton's third law of motion state? 2 marks
6 A car travels 60 metres in 4 seconds, and then accelerates uniformly for 6
seconds to reach a final velocity of 30 m/s What is the car's acceleration
during the second part of the journey? Show your work 4 marks
7 A car travels at a constant speed of 60 km/h for 1 hour, and then at a constant
speed of 40 km/h for the next 2 hours What is the car's average speed for the
8 The school bus slows from 60 km/h to 40 km/h when entering the school
zone
a Calculate the conversion of these speeds from km/h to m/s 2 marks
b Given that this change of speed occurred over 8 seconds, calculate the
Show your work
9 Sketch a graph and describe the motion of an object in freefall.
a Sketch a graph of an object in freefall 2 marks
c Which of Newton's laws is the most relevant in this situation? 2 marks
10 A small object drops from the ceiling and hits the floor after 0.8 seconds Due
to the size of the object, air resistance can be ignored What is the speed of the
object when it reaches the floor? Show your work 2 marks